E40 LED Filament Bulb 38W 7500lm IP65 - Cool White

This high-power LED bulb has a large E40 Goliath Edison Screw (GES) cap and a slim clear glass tube, 46mm across and 207mm long, with LED filaments inside. It is made for large fittings that took high-wattage discharge lamps, and it draws 38W to give 7500lm of 4000K cool white light, an efficiency of 197lm/W. The maker rates it as replacing 402W. To match it to the lamp already in a fitting, we suggest comparing lumens, not watts: lumens measure the light given out, watts only the power drawn, so the old lamp's lumen figure tells you whether 7500lm will do the same job.

It is for anyone keeping an outdoor E40 fitting in service, whether over a yard, along a drive or on the wall of an outbuilding. The maker lists its place of application as outdoors, and the lamp is rated IP65: sealed against dust and protected against jets of water from any direction. That rating covers the lamp, so the fitting needs a suitable rating of its own. Its 320° beam angle sends light almost all the way round the tube rather than in a single cone. Colour rendering is Ra 70, common in outdoor lighting where seeing clearly matters more than judging colour; indoor lamps are usually Ra 80 or above.

The light comes from LED filaments coated in phosphor. The LED light underneath is blue and the phosphor turns it white, which is why the filaments look yellow when the lamp is off. It weighs 146g, runs on 220-240V AC at 50Hz and is not dimmable, so put it on a plain switched circuit. The rated life is 25000 hours, a little under six years lit for twelve hours every night. Behind an opal diffuser it simply reads as light; behind clear glass, the slim tube and its filaments stay on show.

Product Specification Sheet

Range Datasheet

Will it fit a standard screw bulb holder?

No. It has an E40 Goliath Edison Screw cap, about 40mm across the thread, while the standard household Edison Screw is E27, about 27mm, so it needs an E40 lampholder. Check too that the fitting has room for a tube 46mm across and 207mm long.

Does the old ballast need bypassing?

Discharge-lamp fittings run their lamps through control gear: a ballast and, on many, an ignitor. This lamp is rated for a 220-240V AC supply at 50Hz, and we cannot confirm from the maker's figures whether it will run through that gear. Check the specification sheet above, and have an electrician confirm how the fitting is wired before you change the lamp.

Is it waterproof?

It is rated IP65: sealed against dust and protected against jets of water from any direction, though IP65 does not cover immersion. The maker lists outdoors as its place of application. The rating covers the lamp only, so the fitting around it needs a suitable rating of its own.

Can I use it with a dimmer switch?

No, it is not dimmable, so run it from a plain on/off switch. A non-dimmable LED lamp on a dimmer circuit can flicker or buzz, and may fail early.

Why do the filaments look yellow if the light is cool white?

The yellow is the phosphor coating on the filaments. The LED light underneath is blue and the phosphor turns it white, so the filaments look yellow while the lamp is off and give 4000K cool white light once it is switched on.

How long will it last, and what does it cost to run?

The rated life is 25000 hours, a little under six years if it is lit for twelve hours every night. At 38W it uses 0.38kWh for every ten hours it is on, so multiply that by the unit rate on your electricity bill to find the running cost.